When I execute below code it overwrite the existing file. I want to keep old file and new file too. What can be done here? Can we rename it like Test(1).xlsx, Test(2).xlsx, Test(3).xlsx like windows pattern?
File excel = new File("C:\\TEST\\Test.xlsx");
try (FileInputStream fis = new FileInputStream(excel);
XSSFWorkbook book = new XSSFWorkbook(fis);) {
..
..
..
try (FileOutputStream outputStream = new FileOutputStream("C:\\TEST\\Output\\Test.xlsx")) {
book.write(outputStream);
}
}
You can check if the file already exists using the exists() method before you start writing to it.
If the file already exists, write to a different file.
File excel = new File(determineFileName());
try (FileInputStream fis = new FileInputStream(excel);
XSSFWorkbook book = new XSSFWorkbook(fis);) {
...
}
with
private String determineFileName(){
String path = "C:\\TEST\\Test.xlsx";
int counter = 0;
while(new File(path).exists()){
counter++;
path = "C:\\TEST\\Test(" + counter + ").xlsx";
}
return path;
}
Related
I have a scenario where first I update an excel column with certain values using one test case (test case 1) and then use that file for upload in the next test case (test case 2). I am able to successfully update the file and also able to browse the file for upload. the problem is that the content is not being read from the file. I just have to open the excel file created and perform the save action manually and then when I run the test (test case 2)related to uploading it works perfectly fine. I am not sure what is causing the issue. it would be of great help if someone can support this issue.
Here are the test steps
Update file column values - code snippet
public void setColValues(String fileName, String sheetName, int colIndex, List<Integer> sData) {
try {
String excelPath = System.getProperty("director to file path");
FileInputStream fis = new FileInputStream(excelPath);
XSSFWorkbook workbook = new XSSFWorkbook(fis);
XSSFSheet sh = workbook.getSheet(sheetName);
int rowCount = sh.getLastRowNum();
logger.info(rowCount);
int index = 0;
for (int rowCounter = 2; rowCounter <= rowCount; rowCounter++) {
sh.getRow(rowCounter).getCell(colIndex).setCellValue(sData.get(index));
index++;
}
fis.close();
FileOutputStream fos = new FileOutputStream(new File(excelPath), false);
workbook.write(fos);
workbook.close();
fos.close();
fis.close();
} catch (Exception e) {
e.printStackTrace();
}
}
go to a specific URL
Click the browse button and pass the file path
Click the button to upload
It might be because you are not passing a File instance to FileInputStream constructor?
You wrote:
FileInputStream fis = new FileInputStream(excelPath);
Try instead:
FileInputStream inputStream = new FileInputStream(new File(excelPath));
I'm trying to create sub directories in my apps cache folder but when trying to retrieve the files I'm getting nothing. I have some code below on how I created the sub directory and how I'm reading from it, maybe I'm just doing something wrong (well clearly I am lol) or maybe this isn't possible? (though I haven't seen anywhere that you can't). thank you all for any help!
creating the sub dir
File file = new File(getApplicationContext().getCacheDir(), "SubDir");
File file2 = new File(file, each_filename);
Toast.makeText(getApplicationContext(), file2.toString(), Toast.LENGTH_SHORT).show();
stream = new FileOutputStream(file2);
stream.write(bytes);
reading from it
File file = new File(context.getCacheDir(), "SubDir");
File newFile = new File(file, filename);
Note note;
if (newFile.exists()) {
FileInputStream fis;
ObjectInputStream ois;
try {
fis = new FileInputStream(new File(file, filename));
ois = new ObjectInputStream(fis);
note = (Note) ois.readObject();
fis.close();
ois.close();
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
return null;
}
return note;
}
I've also tried with this and nothing
String file = context.getCacheDir() + File.separator + "SubDir";
I don't see anywhere in the code you posted where you actually create the sub-directory. Here's some example code to save a file in a sub-directory, by calling mkdirs if the path doesn't yet exist (some parts here need to be wrapped in an appropriate try-catch for an IOException, but this should get you started).
File cachePath = new File(context.getCacheDir(), "SubDir");
String filename = "test.jpeg";
boolean errs = false;
if( !cachePath.exists() ) {
// mkdir would work here too if your path is 1-deep or
// you know all the parent directories will always exist
errs = !cachePath.mkdirs();
}
if(!errs) {
FileOutputStream fout = new FileOutputStream(cachePath + "/" + filename);
fout.write(bytes.toByteArray());
fout.flush();
fout.close();
}
You need to make your directory with mkdir.
In your code:
File file = new File(getApplicationContext().getCacheDir(), "SubDir");
file.mkdir();
File file2 = new File(file, each_filename);
I have a block of jsp code like this. Here blockerdata, criticaldata, majordata and minordata are stringbuilder strings and their value is appended through a loop and value is assigned dynamically. Now I'm tryong to write them into an xml file like this.
<%
System.out.println(blockerdata);
System.out.println(criticaldata);
System.out.println(majordata);
System.out.println(minordata);
try
{
File file1 = new File("WebContent/criticaldata.xml");
File file2 = new File("WebContent/majordata.xml");
File file3 = new File("WebContent/minordata.xml");
File file4 = new File("WebContent/blockerdata.xml");
FileOutputStream fop1 = new FileOutputStream(file1);
FileOutputStream fop2 = new FileOutputStream(file2);
FileOutputStream fop3 = new FileOutputStream(file3);
FileOutputStream fop4 = new FileOutputStream(file4);
// if file doesnt exists, then create it
if (!file1.exists()) {
file1.createNewFile();
}
if (!file2.exists()) {
file2.createNewFile();
}
if (!file3.exists()) {
file3.createNewFile();
}
if (!file4.exists()) {
file4.createNewFile();
}
// get the content in bytes
byte[] contentInBytes1= criticaldata.toString().getBytes();
byte[] contentInBytes2= majordata.toString().getBytes();
byte[] contentInBytes3= minordata.toString().getBytes();
byte[] contentInBytes4= blockerdata.toString().getBytes();
fop1.write(contentInBytes1);
fop2.write(contentInBytes1);
fop3.write(contentInBytes1);
fop4.write(contentInBytes1);
fop1.flush();
fop2.flush();
fop3.flush();
fop4.flush();
fop1.close();
fop2.close();
fop3.close();
fop4.close();
}
catch ( IOException e)
{
}
%>
Problem is, the code doesn't seem to be working. I tried to do it using printwriter also but
the files are not being generated. Also I want to rewrite the file if it already exists. Can somebody please help me on how to do this ?
I have a filename in my code as :
String NAME_OF_FILE="//sdcard//imageq.png";
FileInputStream fis =this.openFileInput(NAME_OF_FILE); // 2nd line
I get an error on 2nd line :
05-11 16:49:06.355: ERROR/AndroidRuntime(4570): Caused by: java.lang.IllegalArgumentException: File //sdcard//imageq.png contains a path separator
I tried this format also:
String NAME_OF_FILE="/sdcard/imageq.png";
The solution is:
FileInputStream fis = new FileInputStream (new File(NAME_OF_FILE)); // 2nd line
The openFileInput method doesn't accept path separators.
Don't forget to
fis.close();
at the end.
This method opens a file in the private data area of the application. You cannot open any files in subdirectories in this area or from entirely other areas using this method. So use the constructor of the FileInputStream directly to pass the path with a directory in it.
openFileInput() doesn't accept paths, only a file name
if you want to access a path, use File file = new File(path) and corresponding FileInputStream
I got the above error message while trying to access a file from Internal Storage using openFileInput("/Dir/data.txt") method with subdirectory Dir.
You cannot access sub-directories using the above method.
Try something like:
FileInputStream fIS = new FileInputStream (new File("/Dir/data.txt"));
You cannot use path with directory separators directly, but you will
have to make a file object for every directory.
NOTE: This code makes directories, yours may not need that...
File file= context.getFilesDir();
file.mkdir();
String[] array=filePath.split("/");
for(int t=0; t< array.length -1 ;t++)
{
file=new File(file,array[t]);
file.mkdir();
}
File f=new File(file,array[array.length-1]);
RandomAccessFileOutputStream rvalue = new RandomAccessFileOutputStream(f,append);
String all = "";
try {
BufferedReader br = new BufferedReader(new FileReader(filePath));
String strLine;
while ((strLine = br.readLine()) != null){
all = all + strLine;
}
} catch (IOException e) {
Log.e("notes_err", e.getLocalizedMessage());
}
File file = context.getFilesDir();
file.mkdir();
String[] array = filePath.split("/");
for(int t = 0; t < array.length - 1; t++) {
file = new File(file, array[t]);
file.mkdir();
}
File f = new File(file,array[array.length- 1]);
RandomAccessFileOutputStream rvalue =
new RandomAccessFileOutputStream(f, append);
I solved this type of error by making a directory in the onCreate event, then accessing the directory by creating a new file object in a method that needs to do something such as save or retrieve a file in that directory, hope this helps!
public class MyClass {
private String state;
public File myFilename;
#Override
protected void onCreate(Bundle savedInstanceState) {//create your directory the user will be able to find
super.onCreate(savedInstanceState);
if (Environment.MEDIA_MOUNTED.equals(state)) {
myFilename = new File(Environment.getExternalStorageDirectory().toString() + "/My Directory");
if (!myFilename.exists()) {
myFilename.mkdirs();
}
}
}
public void myMethod {
File fileTo = new File(myFilename.toString() + "/myPic.png");
// use fileTo object to save your file in your new directory that was created in the onCreate method
}
}
I did like this
var dir = File(app.filesDir, directoryName)
if(!dir.exists()){
currentCompanyFolder.mkdir()
}
var directory = app.getDir(directoryName, Context.MODE_PRIVATE)
val file = File(directory, fileName)
file.outputStream().use {
it.write(body.bytes())
}
how to check if file exists and open it?
if(file is found)
{
FileInputStream file = new FileInputStream("file");
}
File.isFile will tell you that a file exists and is not a directory.
Note, that the file could be deleted between your check and your attempt to open it, and that method does not check that the current user has read permissions.
File f = new File("file");
if (f.isFile() && f.canRead()) {
try {
// Open the stream.
FileInputStream in = new FileInputStream(f);
// To read chars from it, use new InputStreamReader
// and specify the encoding.
try {
// Do something with in.
} finally {
in.close();
}
} catch (IOException ex) {
// Appropriate error handling here.
}
}
You need to create a File object first, then use its exists() method to check. That file object can then be passed into the FileInputStream constructor.
File file = new File("file");
if (file.exists()) {
FileInputStream fileInputStream = new FileInputStream(file);
}
You can find the exists method in the documentation:
File file = new File(yourPath);
if(file.exists())
FileInputStream file = new FileInputStream(file);